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9. Didn't JKR confirm that the amount of magic in Hogwarts does interfere with electronic signals? I'm guessing that the same would be true for places like Diagon Alley and the Ministry for Magic. Also, a lot of the pureblood families would look down on all Muggle technology and insist that magic use is better.

7. I'm guessing that the capacity for someone who's also protected by a Fidelius Charm to be their Secret Keeper's Secret Keeper was only developed during the last decade and a half, after James and Lily's deaths.

6. This is explained in the books. Harry is more effected by the Dementors because he has traumas others don't. Neville, as far as we know, didn't witness his parents' torture. Harry was present when his mother died, though he was too young to actually understand.

5. You need to have understood the concept of death at the time of witnessing it to be able to see Thestrals.

3. The Map shows thousands of people at Hogwarts. The twins weren't that interested in using it to spy on their younger brother, so they didn't notice the name of one of his room-mates.

2. That's still the wand choosing the wizard. The wands choose to respect the greater strength of whoever took them, and change their allegiance. This is normally reversed when the original owner reclaims it, or when the second person returns it.